Awesome and great in the true senses of the words. Harrowing and exciting in equal measure. Remember when 'Game of Thrones' was actually good and could make you empathise with 'bad' characters, and how no-one was safe? This has that in spades.
The story is brilliant, not since 'Spec Ops: The Line' has an action game made you question your players' impact on the world in such a way. Full of twists and surprises, it's very difficult to put down.
Also, the sheer amount of entertainment you get for your money is good value, something between 25-30 hours!